Where to start reading after the anime
Finished Season 1, 2 or 3 of That Time I Got Reincarnated as a Slime? Find the exact light-novel volume and story record the anime has not reached, and what each season skipped.
Season by season
After Season 1 — start at Volume 4Season 1 covered roughly Volumes 1 to 4 and skipped Rimuru's time in Ingracia with Eren, so Volume 4 is where the missing material begins.After Season 2 — start at Volume 7Season 2 ran through Volume 6, finishing the Falmuth invasion, the Demon Lord evolution and Walpurgis.After the Scarlet Bond film — start at Volume 7Scarlet Bond is an anime-original story with no novel equivalent, so it leaves no gap to fill.After Season 3 — start at Volume 10Season 3 reached the end of Volume 9, so Volume 10 and the Western Council is the first material with no animated version.
How this mapping was made
Season boundaries do not line up with volume boundaries. Where a season ends mid-volume the archive recommends restarting at the start of that volume rather than dropping you into the middle of one. The publication references behind these volume numbers are listed on the continuity and sources page.